17 



each other an angle of a little more than 90°. Length from posterior to 

 anterior ventral angles 14 Hnes ; height to the umbones 10 hnes ; depth of 

 both valves about 9 lines. Macasty Bay ; H. R. T. C. Weston. 



Dedicated to Professor Alexander Winchell, of Ann Arbor, Michigan. 



Genus Ambonychia, Hall. 



A. RADIATA, Hall. — A variety of this species occurs at Charleton Point 

 and Enghsh Head ; H. R. Also abundantly at Gamache Bay ; Div. 1, 

 A. G. 



GASTEROPODA. 



Genus SuBULiTES, Conrad. 



S. RiCHARDSONi,B.,Rep. 1857, p. 306.— Charleton Point ; H. R. 

 S. ELONGATA, Conrad. — A variety or closely alUed species occurs at 

 Macasty Bay ; H. R. Also at Junction Cliff; Div. 1, A. G. 



Genus Trochonema, Salter. 



T. UMBILICATA, Hall. — Enghsh Head ; H. R. 



Genus Pleurotomaria, Defrance. 



P. Americana, B., Can. Nat. Geol., vol. v, p. 164. — Charleton Point, 

 and Macasty Bay ; H. R. 



P. Helena, B., op. cit., p. 165. — Charleton Point and Table Head; 

 Div. 1, H. R. 



p. CIRCE, B., op. cit., p. 303. — English Head ; H. R. 



P. SUBCONICA, Hall. — Macasty Bay and English Head ; H. R. 



Genus Cyclonema, Hall. 



Fig. 5. 



Fig. 5. — Oyclonema Thalia. A specimen enlarged three diameters. 



C. Thalia, B.,Rep., 1857, p. 303.— Charleton Point; H. R. Also at 

 Junction Cliff; Div. 1, A. G. Pleurotomaria Thalia, loc. cit. 



